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D( x )
49*x^5 < 0
49*x^11 < 0
49*x^5 < 0
49*x^5 < 0
49*x^5 < 0
49*x^5 < 0 // : 49
x^5 < 0/49
x^5 < 0
x^5 < 0 // ^ 1/5
x < 0
x in (-oo:0)
49*x^11 < 0
49*x^11 < 0
49*x^11 < 0
49*x^11 < 0 // : 49
x^11 < 0/49
x^11 < 0
x^11 < 0 // ^ 1/11
x < 0
x in (-oo:0)
x in <0:+oo)
(49*x^5)^(1/4)*(49*x^11)^(1/4) = 0
7*x^4 = 0 // : 7
x^4 = 0
x = 0
x = 0
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